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A superintendent wants to survey teachers in his district to determine their opinions on the new school calendar.There are 14 different schools located in this

A superintendent wants to survey teachers in his district to determine their opinions on the new school calendar.There are 14 different schools located in this school district.The superintendent randomly picks 4 of the 14 schools.At each of the 4 selected schools, they randomly pick 10 teachers to survey (for a total of 40 teachers).What kind of study design is this?

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